Fixing device for cloth belt wheel rotating shaft of forming machine

Abstract

The utility model discloses a fixing device for a cloth belt wheel rotating shaft of a forming machine, and relates to the field of mechanical equipment. A cavity is coaxially formed in a driving shaft, an annular groove is formed in the outer side wall of the driving shaft, an assembling pipe is arranged in the groove, the two ends of the assembling pipe are fixedly connected with the outer wall of the driving shaft respectively, the outer side wall of the assembling pipe is flush with the outer side wall of the driving shaft, a containing cavity is formed between the groove and the assembling pipe, and the containing cavity is communicated with the cavity. The containing cavity and the cavity are both filled with hydraulic oil. The assembly pipe has the advantages that hydraulic oil is injected into the containing cavity, the assembly pipe is controlled to expand and contract, interference assembly and disassembly of the cloth belt wheel are labor-saving, simple and convenient, and the disassembly and assembly efficiency of the cloth belt wheel is improved.

Description

Technical Field

[0001] The utility model belongs to the field of mechanical equipment, relates to the field of filter rod forming machines, and particularly relates to a fixing device for a cloth belt wheel rotating shaft of a forming machine. Background Art

[0002] A filter rod forming machine is a device specifically designed for producing cigarette filter rods. During operation, a cloth pulley drives and guides the filter rod forming carton tow through the forming area, ensuring continuous and precise filter rod production. Speed ​​and position are also adjusted to control the length and quality of the filter rods.

[0003] The cloth pulley is driven by an independent motor. After a period of use, it requires regular maintenance and care. Wear or failure of the pulley and its associated components may require disassembly and assembly. The pulley is mounted on the motor's drive shaft. Nut fastening or interference fit methods are commonly used to secure the pulley to the drive shaft. When using the nut fastening method, the drive shaft is inserted through the pulley's axial hole, and the nut is then tightened onto the drive shaft. A wrench or other tool is used to tighten the nut to the manufacturer's recommended torque to ensure the pulley is securely attached to the drive shaft. Overtightening, which may damage the drive shaft or pulley, is also crucial. When using the interference fit method, the pulley's axial hole and drive shaft form a transition fit with a small amount of interference. Therefore, press-fitting or temperature differential methods are often used to assemble the pulley to the drive shaft. Stress concentration is high at the edges of the mating surfaces between the pulley and the drive shaft, making assembly and disassembly more difficult.

[0004] Therefore, when the cloth pulley is assembled onto the drive shaft by adopting the above-mentioned nut fastening method or interference fitting method, multiple tools are required, and the operation is time-consuming and labor-intensive, which affects the assembly and disassembly speed of the cloth pulley. Utility Model Content

[0005] To address the technical issue of time-consuming and labor-intensive assembly and disassembly of a cloth pulley, which impacts efficiency, this utility model provides a fixing device for the rotating shaft of a cloth pulley in a forming machine. By filling a cavity with hydraulic oil to control the expansion and contraction of the assembly tube, the interference fit assembly and disassembly of the cloth pulley is simplified and labor-saving, thereby improving assembly and disassembly efficiency.

[0006] The technical solution adopted by the utility model is: to provide a fixing device for the rotating shaft of the cloth pulley of a forming machine, comprising a driving shaft, a cavity coaxially provided in the driving shaft, an annular groove provided on the outer wall of the driving shaft, an assembly tube provided in the groove, two ends of the assembly tube are respectively fixedly connected to the outer wall of the driving shaft, and the outer wall of the assembly tube is flush with the outer wall of the driving shaft, a cavity is formed between the groove and the assembly tube, the cavity is connected to the cavity, and both the cavity and the cavity are filled with hydraulic oil.

[0007] When assembling the cloth pulley and the drive shaft, push the cloth pulley onto the assembly tube, and then continue to fill the cavity of the drive shaft with hydraulic oil to increase the pressure value in the cavity. The cavity and the receiving chamber are connected, so that the pressure value in the receiving chamber is also increased synchronously. Due to the incompressibility of the hydraulic oil, the hydraulic oil acts evenly on the assembly tube, causing the assembly tube to be expanded, thereby interference fitting with the cloth pulley, making assembly simple and efficient. When disassembling the cloth pulley, the hydraulic oil in the cavity and the receiving chamber is pumped out to generate negative pressure in the receiving chamber. The negative pressure sucks the assembly tube, causing it to shrink and reset, thereby releasing the interference fitting on the cloth pulley, and making the cloth pulley lose its constraint, making it equally simple and efficient to disassemble.

[0008] To further optimize the technical solution, the front end thread of the drive shaft is sealed with a cover, a hydraulic valve and a pressure relief valve are provided on the cover, and both the hydraulic valve and the pressure relief valve are connected to the cavity.

[0009] The hydraulic oil is injected into and sucked out of the cavity and the receiving cavity through the hydraulic valve, which is easy to operate. After the hydraulic valve is closed, the hydraulic pressure in the cavity and the receiving cavity is maintained stable. The pressure relief valve on the cover can relieve the pressure in the cavity and the receiving cavity in time to avoid excessive hydraulic pressure in the receiving cavity, which may cause damage to the assembly pipe due to excessive expansion, and damage to the cloth pulley, thereby improving safety in use.

[0010] To further optimize the present technical solution, the cover includes a connecting section and a head, the connecting section is threadedly connected to the cavity of the drive shaft; the head of the cover is a polygonal structure, the diameter of the head is larger than the diameter of the connecting section and smaller than the diameter of the drive shaft, and abuts against the end face of the drive shaft.

[0011] The polygonal structure of the cover head makes it convenient to disassemble and assemble the cover and the drive shaft with the help of a wrench. The connecting section of the cover is threadedly connected to the cavity. The head of the cover is larger than the diameter of the connecting section. After the head abuts against the drive shaft, the cover is assembled in place. The diameter of the head is smaller than the diameter of the drive shaft, which does not interfere with the assembly of the cloth pulley and is smooth to use.

[0012] To further optimize the technical solution, an internal thread is provided on the connecting section of the cover, and an O-ring is provided on the side of the connecting section close to the head; an external thread matching the internal thread is provided in the cavity, and a preset gap is provided between the external thread and the end of the drive shaft, and the O-ring is sealed and sleeved with the preset gap.

[0013] When the connecting section of the cover is threadedly connected to the cavity, the O-ring on the connecting section is placed at the preset gap of the cavity, thereby ensuring the sealing effect of the assembly of the cover and the drive shaft, avoiding leakage of hydraulic oil in the cavity and the containing cavity, and ensuring safety in use.

[0014] To further optimize the technical solution, an annular gasket is provided between the O-ring and the cover head, with both ends of the gasket respectively abutting against the end face of the drive shaft and the cover head.

[0015] The two ends of the gasket are respectively in contact with the drive shaft, the end face and the head of the cover. The gasket disperses the contact pressure of the cover head, making the stress distribution between the contact surfaces more uniform, ensuring the firmness of the cover assembly, and can serve as a sacrificial layer to prevent the drive shaft from corrosion and wear, and compensate for the thermal expansion difference caused by temperature changes, so that the assembly and use of the cover are stable and reliable.

[0016] To further optimize the technical solution, a protective sleeve is provided on the outer wall of the assembly tube, and two ends of the protective sleeve respectively protrude from the two ends of the assembly tube and are sleeved on the drive shaft.

[0017] When the cloth pulley is assembled on the drive shaft, the protective sleeve reduces the contact wear between the cloth pulley and the drive shaft and the assembly tube, improves the protection effect of the drive shaft and the assembly tube, and increases the assembly friction, thereby ensuring the assembly firmness of the cloth pulley.

[0018] To further optimize the technical solution, the outer side wall of the assembly tube is provided with anti-slip grooves.

[0019] The anti-slip pattern improves the friction between the protective cover and the cloth pulley, ensuring the firmness of the cloth pulley assembly.

[0020] To further optimize the technical solution, the groove is provided with flow holes evenly distributed along the circumference, and the accommodating cavity and the cavity are connected via the flow holes.

[0021] The cavity is connected to the containing cavity through the flow holes on the groove, and the flow holes are evenly distributed in the circumferential direction in the groove to ensure the uniformity of the flow of the hydraulic oil.

[0022] To further optimize this technical solution, the drive shaft and the assembly tube are both made of stainless steel, and both the drive shaft and the assembly tube are electroplated.

[0023] The drive shaft and assembly tube are made of stainless steel, which is corrosion-resistant and wear-resistant, can adapt to the operating environment, improve its reliability and extend its service life.

[0024] The beneficial effects of the present invention are:

[0025] 1. After pushing the cloth pulley to the assembly tube of the drive shaft, fill the drive shaft with hydraulic oil to increase the pressure in the cavity and the volume chamber. Due to the incompressibility of the hydraulic oil, the hydraulic pressure in the volume chamber and the cavity is increased, and the hydraulic expansion assembly tube expands. The hydraulic pressure expands the assembly tube evenly, making it interference fit with the cloth pulley, ensuring assembly strength, improving reliability, and making the operation simple and efficient.

[0026] 2. When disassembling the cloth pulley, the hydraulic oil in the chamber and the cavity is sucked to reduce the pressure in the chamber and the cavity. When the pressure drops to negative pressure, the assembly pipe is sucked to reset and shrink, thereby releasing the interference fit with the cloth pulley, making disassembly simple and efficient.

[0027] 3. When assembling the cloth pulley and the drive shaft, the protective sleeve is put on the drive shaft. The protective sleeve reduces the wear of the cloth pulley and the drive shaft. The anti-slip grooves on the assembly tube and the protective sleeve increase the friction between the assembly tube and the cloth pulley, thereby improving the firmness of the assembly. The diameter of the cover head is smaller than that of the drive shaft, which does not interfere with the assembly of the cloth pulley, thus ensuring smooth assembly.

[0028] 4. The oil pump fills and draws hydraulic oil into the cavity and the receiving cavity through the hydraulic valve on the cover. The operation is simple and the O-ring on the cover ensures the sealing of the assembly between the cover and the drive shaft. When filling the hydraulic oil, the pressure relief valve on the cover can timely relieve the pressure in the cavity and the receiving cavity to avoid excessive hydraulic pressure in the receiving cavity, which may cause damage to the assembly pipe due to excessive expansion and damage to the cloth pulley, thereby improving the safety of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic structural diagram of a fixing device for a cloth pulley shaft of a forming machine according to this embodiment;

[0030] Figure 2 This is a schematic cross-sectional view of the fixing device for the cloth belt pulley shaft of the forming machine according to this embodiment;

[0031] Figure 3 This is a schematic diagram of the disassembled structure of the drive shaft, assembly tube and protective sleeve of this embodiment;

[0032] Figure 4 This is a schematic diagram of the disassembled structure of the drive shaft and the cover of this embodiment;

[0033] Figure 5 Schematic diagram of the structure of the drive shaft of this embodiment;

[0034] Figure 6 Schematic diagram of the structure of the cover of this embodiment.

[0035] In the figure, 1. drive shaft; 101. cavity; 1011. external thread; 102. groove; 1021. flow hole; 2. assembly tube; 201. cavity; 202. anti-slip groove; 3. cover; 301. connecting section; 3011. internal thread; 3012. O-ring; 302. head; 4. hydraulic valve; 5. pressure relief valve; 6. gasket; 7. protective cover. DETAILED DESCRIPTION

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0037] Please see the attached Figure 1-3 The fixing device of the cloth belt wheel shaft of the forming machine includes a drive shaft 1 assembled with the motor, a cavity 101 is coaxially provided in the drive shaft 1, an annular groove 102 is provided on the outer wall of the drive shaft 1, an assembly tube 2 is provided in the groove 102, and both ends of the assembly tube 2 are fixedly connected to the outer wall of the drive shaft 1. Both the assembly tube 2 and the drive shaft 1 can be made of stainless steel. The corrosion resistance and wear resistance of stainless steel improve its reliability, and the assembly tube 2 can be welded and fixed to the drive shaft 1, and the outer surface of the assembly tube 2 can be ensured by turning. The side wall is flush with the outer wall of the drive shaft 1 to ensure smooth assembly of the cloth pulley. A cavity 201 is formed between the assembly tube 2 and the groove 102 on the drive shaft 1. A flow hole 1021 is drilled and punched in the circumferential direction in the groove 102. The flow hole 1021 connects the cavity 201 with the cavity 101. After the cloth pulley is inserted into the assembly tube 2, hydraulic oil is injected into the cavity 101. The hydraulic oil is injected into the cavity 201. After the pressure in the cavity 201 is increased, the assembly tube 2 is expanded to be interference-fitted with the cloth pulley, ensuring the firmness of the assembly.

[0038] Please see the attached Figure 1-2 The front end thread seal of the driving shaft 1 is connected with a cover 3, which seals the cavity 101. The cover 3 includes a connecting section 301 and a head 302. The head 302 of the cover 3 is a polygonal structure, which is convenient for tightening the cover 3 on the driving shaft 1 with the help of a tool. The diameter of the head 302 is larger than the diameter of the connecting section 301. After the head 302 abuts against the end face of the driving shaft 1, the further movement of the cover 3 is restricted and it is installed in place. The diameter of the cover 3 is smaller than the diameter of the driving shaft 1, which does not interfere with the assembly of the cloth pulley, ensuring smooth use.

[0039] Please see the attached Figure 4-6 , an internal thread 3011 is provided on the connecting section 301 of the cover 3, and an external thread 1011 matching the internal thread 3011 is provided in the cavity 101 of the drive shaft 1, and a preset gap is provided between the external thread 1011 and the end of the drive shaft 1. When the connecting section 301 is threadedly assembled with the cavity 101, an O-ring 3012 is provided on the side of the connecting section 301 close to the head 302. The O-ring 3012 is pushed into the cavity 101 along with the connecting section 301 and is internally sleeved into the preset gap between the cavity 101 and the external thread 1011, thereby ensuring the sealing of the assembly of the cover 3 and the cavity 101, avoiding leakage of hydraulic oil, and ensuring reliability in use;

[0040] Please see the attached Figure 2 , Attachment Figure 4On the connecting section 301 of the cover 3, an annular gasket 6 is provided between the O-ring 3012 and the head 302. The two ends of the gasket 6 respectively abut against the end face of the drive shaft 1 and the head 302 of the cover 3. The gasket 6 disperses the contact pressure of the head 302 of the cover 3, making the stress distribution between the contact surfaces more uniform, ensuring the firmness of the assembly of the cover 3, and can also serve as a sacrificial layer to prevent the drive shaft 1 from corrosion and wear, and compensate for the thermal expansion difference caused by temperature changes, so that the assembly and use of the cover 3 are stable and reliable;

[0041] Please see the attached Figure 1-3 When the cloth pulley is pushed onto the drive shaft 1, a protective sleeve 7 is provided on the outside of the assembly tube 2. The two ends of the protective sleeve 7 protrude from the two ends of the assembly tube 2 and are sleeved on the drive shaft 1. The protective sleeve 7 shields and protects the drive shaft 1 and the assembly tube 2. The outer wall of the assembly tube 2 is provided with anti-slip grooves 202. The anti-slip grooves 202 ensure the firmness of the assembly of the protective sleeve 7 and the cloth pulley and reduce the wear of the assembly tube 2 and the drive shaft 1.

[0042] Please see the attached Figure 1 , Attachment Figure 2 , Attachment Figure 6 The sealing cover 3 is equipped with a hydraulic valve 4 and a pressure relief valve 5, both of which are connected to the cavity 101. Hydraulic oil is injected into the cavity 101 of the drive shaft 1 through the hydraulic valve 4, and the pressure value is observed by the pressure gauge on the oil pump to control the expansion of the assembly pipe 2, so that the assembly pipe 2 and the cloth pulley are firmly fitted with an interference fit. When the hydraulic oil is injected into the cavity 101 and the accommodating cavity 201 with excessive pressure, the pressure relief valve 5 performs pressure relief processing to avoid excessive filling of hydraulic oil into the cavity 101 and the accommodating cavity 201, and to avoid damage to the cloth pulley caused by excessive expansion of the assembly pipe 2, thereby ensuring safety in use.

[0043] After the cloth pulley is assembled, the hydraulic valve 4 is closed to maintain the hydraulic pressure in the cavity 101 and the receiving cavity 201 stable. When the cloth pulley is disassembled, the oil pump is reconnected to the hydraulic valve 4 and the hydraulic oil in the cavity 101 and the receiving cavity 201 is extracted to reduce the internal pressure and reset the assembly pipe 2. In this way, the interference fit between the cloth pulley and the assembly pipe 2 is released, making the disassembly of the cloth pulley labor-saving and simple.

[0044] The working principle of the fixing device for the fabric pulley shaft of the forming machine is as follows: After the drive shaft 1 is assembled with the motor, the protective cover 7 is placed on the drive shaft 1, and then the fabric pulley is pushed onto the drive shaft 1. The diameter of the head 302 of the cover 3 is smaller than that of the drive shaft 1, so as not to interfere with the assembly of the fabric pulley and ensure smooth use. After the fabric pulley is placed on the assembly tube 2, the hydraulic valve 4 on the front side of the drive shaft 1 is connected to the oil pump, which fills the cavity 101 and the chamber 201 with hydraulic oil to increase the internal pressure of both. Due to the incompressibility of the hydraulic oil, after the hydraulic pressure in the chamber 201 and the cavity 101 is increased, the hydraulic expansion of the assembly tube 2 is carried out, and the hydraulic expansion of the assembly tube 2 is uniform, so that it is interference-fitted with the fabric pulley, ensuring assembly strength, improving reliability, and being easy and efficient to operate. The pressure relief valve 5 connected to the drive shaft 1 prevents the hydraulic pressure in the cavity 101 and the receiving cavity 201 from being too high, thereby providing timely pressure relief, preventing damage to the assembly tube 2 due to excessive expansion, and preventing damage to the cloth pulley, thereby improving safety in use. After assembly is completed, the hydraulic valve 4 is closed to maintain the hydraulic pressure in the cavity 101 and the receiving cavity 201. After the oil pump is removed, the drive shaft 1 drives the cloth pulley to operate smoothly. When the cloth pulley is disassembled, the oil pump is reconnected to the hydraulic valve 4 and sucks the hydraulic oil in the receiving cavity 201 and the cavity 101, thereby reducing the pressure in the receiving cavity 201 and the cavity 101. When the pressure drops to negative pressure, the assembly tube 2 is sucked to return to its original position and contract, thereby releasing the interference fit with the cloth pulley, making disassembly just as simple and efficient.

Claims

1. A fixing device for a belt pulley shaft of a forming machine, comprising a drive shaft (1), characterized in that: A cavity (101) is coaxially provided in the drive shaft (1), an annular groove (102) is provided on the outer wall of the drive shaft (1), an assembly tube (2) is provided in the groove (102), both ends of the assembly tube (2) are fixedly connected to the outer wall of the drive shaft (1), and the outer wall of the assembly tube (2) is flush with the outer wall of the drive shaft (1), a cavity (201) is formed between the groove (102) and the assembly tube (2), the cavity (201) is connected to the cavity (101), and both the cavity (201) and the cavity (101) are filled with hydraulic oil.

2. The fixing device for the cloth pulley shaft of the forming machine according to claim 1, characterized in that: The front end of the drive shaft (1) is threadedly and sealedly connected to a sealing cover (3), and a hydraulic valve (4) and a pressure relief valve (5) are provided on the sealing cover (3), and both the hydraulic valve (4) and the pressure relief valve (5) are connected to the cavity (101).

3. The fixing device for the cloth pulley shaft of the forming machine according to claim 2, characterized in that: The cover (3) comprises a connecting section (301) and a head (302), wherein the connecting section (301) is threadedly connected to the cavity (101) of the drive shaft (1); the head (302) of the cover (3) is a polygonal structure, wherein the diameter of the head (302) is larger than the diameter of the connecting section (301) and smaller than the diameter of the drive shaft (1), and abuts against the end face of the drive shaft (1).

4. The fixing device for the cloth pulley shaft of a forming machine according to claim 3, characterized in that: An internal thread (3011) is provided on the connecting section (301) of the cover (3), and an O-ring (3012) is provided on a side of the connecting section (301) close to the head (302); an external thread (1011) matching the internal thread (3011) is provided in the cavity (101), and a preset gap is provided between the external thread (1011) and the end of the drive shaft (1), and the O-ring (3012) is sealingly sleeved with the preset gap.

5. The fixing device for the cloth pulley shaft of a forming machine according to claim 4, characterized in that: An annular gasket (6) is provided between the O-ring (3012) and the head (302) of the cover (3), and both ends of the gasket (6) are respectively in contact with the end face of the drive shaft (1) and the head (302) of the cover (3).

6. The fixing device for the cloth pulley shaft of a forming machine according to claim 1, characterized in that: The outer wall of the assembly tube (2) is sleeved with a protective sleeve (7), with two ends of the protective sleeve (7) protruding from two ends of the assembly tube (2) respectively and sleeved on the drive shaft (1).

7. The fixing device for the cloth pulley shaft of a forming machine according to claim 6, characterized in that: The outer side wall of the assembly tube (2) is provided with anti-slip grooves (202).

8. The fixing device for the cloth pulley shaft of a forming machine according to claim 1, characterized in that: The groove (102) is provided with circulation holes (1021) uniformly distributed along the circumferential direction, and the accommodating cavity (201) and the cavity (101) are communicated with each other via the circulation holes (1021).

9. The fixing device for the cloth pulley shaft of a forming machine according to claim 1, characterized in that: The drive shaft (1) and the assembly tube (2) are both made of stainless steel, and both the drive shaft (1) and the assembly tube (2) are electroplated.

Images